Improvement in casters for furniture



l. BLACK'MAN.

Improvement'in Casters for Furniture.

Pat ented Jan. 30, 1872.

UNITED STATES WILLIAM IRELAND BLAOKMAN, OF COLUMBUS, MISSISSIPPI.

IMPROVEMENT IN CASTERS FOR FURNITURE.

Specification forming part of Letters Patent No. 123,147, dated January 30, 1872.

Specification describing certain Improvements in Furniture-Casters, invented by WIL- LIAM I. BLAOKMAN, of Columbus, in the county of Lowndes and State of Mississippi.

This invention relates to a new and useful improvement in casters for furniture, whereby furniture-casters are made more useful and more durable than they have heretofore been;

and it consists in the mode of confining the ball and securing the caster to the leg, as will be hereinafter described.

In the accompanying drawing, Figure 1 represents a vertical section of the caster. Fig. 2 is a cross-section of the shell and shank taken on the line 00 .1: of Fig. 1. Fig. 3 shows the caster let entirely into the leg. Fig. 4 shows the fastening ring to be used against the shoulder on the bottom of the shell.

Similar letters of reference indicate corresponding parts.

A is the leg of the piece of furniture. B is the ball. 0 is the shell in which the ball is confined. D is the shank of the shell. Eis the fastening-ring: F is the thiinble. G is the holding-pin. The shell and shank G and D are made in two pieces, forming a globular opening for the ball and a tapering shank for the leg, as seen in Fig. 1. The main bearing of the ball is at the point H or center of the globular opening; but, to reduce the frictional 7 surface of the shell, there is a small rib,z', with which the center of the ball comes in contact. About one-fourth of the diameter of the ball projects below the shell. The bottom of the thiinble rests upon the shoulder J, and the collar K of the thimble rests upon the top of the fastening-rill g, while the ring itself rests upon the shoulder J. This arrangement is seen in Fig. 1. The fastening-ring E is secured to the end of the leg. The ends (one or both) of the holding-pin G project from the shank over the edge of the thimble, which prevents the caster dropping from the leg when the piece of furniture is raised. In some cases the entire shell and shank will be let into the leg, in which case the larger ring, Fig. 4, will-be used, as represented in Fig. 3, the small ring E being dispensed with.

Having thus described my invention, I claim as new and desire to secure by Letters Patent An improved caster, formed of ball B, twopart shell 0 having rib i and shoulder J, two part shank D,thi1nb1e F having collar k, and pin G, when all are constructed, adapted to each other, and applied to the furniture-leg as and for the purpose described.

WVILLLAM IRELAND BLAOKMAN.

Witnesses:

MARGELLUS WRIGHT HATCH, JOHN MILTON ERVIN. 

